Piston-ring contractor



4. 1,625,258 Apri* 19 1927 M, JELBERT. JR v PISTON RING CONTRACTOR Filed May 5, 1925 M @leer J1"- Patented Apr. 19, 1,927.

MARTIN JELBERT, JR., or LEAD, SOUTH DAKOTA.

PISTON-BING CONTRACTOR.

Application mea May 5,

rEhe invention relates to piston ring contractors, and has for its object to'provide a device of this character, which may be easily and quickly adjusted to various size pistons Jr'or contracting packing rings thereon, and holding the rings contracted until the piston is forced into a cylinder. y

A further object is to provide a piston ring contractor comprising spaced blocks, through one of which blocks an operating screw is threaded, said operating screw is pivotally connected to the other block, whereby upon rotation of the' operating screw, the blocks will be moved together or forced apart, for contracting or expanding the ring engaging loop.

A further object is to connect one end of the loop to the outer block, and to slidably mount said end in a recess in the other block, and to connect the other end of the loop to the inner block by extending the' same inwardly through the block and securing the same to the outer side of the bloclr.

A further object is to provide one of the blocks with a guide rod slidably mounted in an aperture of the other block for guiding the blocks in relation to each other, and niaintaining the same in registration during the rotation of the operating screw.

lith the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

ln the drawing Figure 1 is a top plan view of the contractor.

Figure 2 is a side elevation of the contractor, portion of the band being broken away to better show the structure.

Figure 3 is a sectional view taken on line 3-3 of Figure 1.

Figure 4 is a` sectional view taken on line 4 4 of Figure 1.

Referring to the drawing, the numeral 1 designates a relatively broad spring loop preferably formed from spring brass or steel. and in which loop is received the piston 2 of an engine, and the contractible rings 3 carried thereby. By having a` relatively broad loop 1, substantially all of the piston rings may be held at the same time;

1925. Serial No. 28,118.

thereby obviating several contracting operations in placing a piston in a cylinder. rlhe end 4 of the loop terminates in a straight portion 5, which portion is slidably mounted in the channel 6 of the block 7, and has its end connectedto the outer block 8 by means of screws 9, therefore it will be seen lthat during the contracting and eX pending operation of the loop 1, the portion 5 of the loop will assist in accurately guiding'the bloc rs 7 and 8 in relation to each other during` the rotation of the operating screw 10. The operating screw 10 is threaded through' the block 8 at 11, and is provided with a reduced portion 12 which is rotatably mounted in a bearing 13 of the inner block 7, and is connected thereto by means of a screw 14, the shank of which extends into an annular groove 15 in the reduced portion 12, therefore it will be seen that when the operating screw 1() is rotated, the blocks 7 and 8 will be moved together. To further hold the blocks in registration during their movement, a guide rod 16 is provided, which guide rod is tightly fitted in the aperture 17 of the block 8 and is slidably mounted in a bearing 18 of the block 7, therefore it will be seen that the rod 16 and the end 5 of the loop will combine to form means for rigidly maintaining blocks 7 and 8 in registration.

The end 19 of the loop entends through the channel 6 of the block 7 in engagement with the outer side of the portion 5 of the loop` and is bent at 20 onto the outer side of the block 7, and is rigidly connected at 21 to the block, therefore it will be seen that when the operating screw 10 is rotated by the operator grasping the hand wheel 22, the loop 1 will be contracted or expanded according to the direction of rotation of the operating screw. 1t will also be seen that the device has a wide range of adjustability whereby it will accommodate itself for use in connection with pistons of various diameters, therefore the same contractor may be used in connection with different size pistons.

From the above it will be seen that a piston ring contracting device is provided which is simple in construction, provided with a relatively wide band forming the loop for receiving a plurality of rings and by forming the loop from spring material that said loop will expand in size under the spring action of the material, and will maintuin Suhrhintialliv a round torni for receiving therein a piston and rings carried h5 the pintons.

The invention haring heen set forth whatr is eliiiined as new and useul is:-

l. )i ringl contractor comprising` spaced hlorhs. an operating screw threaded through one ot the liloelis and rotatably inounted in the other hloiflt, a `guide rod carried hy one olf the hloeks and slidalfil;Y mounted in the other hloolt, an expansilole loop, one end of said loop teianiuatint;l in a tiat` portion, said liar portion haring its end anchored to one ot the hlorhs and Slidiihl)v niounted in u channel ot the other block, the other end of said loop extendin` through the channel ot' said lat nained hloeli and anchored to the outer side ot' the hloeli.

2. t ri ng contracting device comprising an expunrsihle loop formed troni spring inziteriel, .inner and outer spaced hloeks, one end ot the loop extendingo)v through af channel in the inner hloel; and anchored to the outer hloel, the other end ot said loop extendingl through said channel and anchored to the outer hloelr, un operatingjr screw threaded through the outer block and rotatably niounted in the inner hloekl` a guide rod oarried hy the outer block, said guide rod heilig` Slidahly mounted in af hearing of the inner block.

El. The combination with :i ring contractor comprising :l flexible loop, spaced blocks, an operating screw rotatably inounted .in one oi" the blocks and threaded through the other block, one end oi said loop being;l anchored to one oi the blocks, ot ineens tor maintaining said hloelie in registration during the rota-tion ot the sei-eu', said ineens oonilnising one end ot said loop, said loop end extending through a slot in one of the blocks and anchored to the other block, and zi guide rod Carried by one ol the blocks; and :slidahbv niounted in the other blot-k.

ln teetiniony whereof I aliix nw signature.

Maurin JELB'ERT, Jn. 

